ipa: libipa: vector: Add element-wise min() and max() functions

Add functions to calculate the element-wise minimum and maximum of two
vectors or of a vector and a scalar. This will be used in algorithm
implementations.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>

src/ipa/libipa/vector.cpp

@@ -176,6 +176,34 @@ namespace ipa {
  * \return This vector
  */
 
+/**
+ * \fn Vector::min(const Vector &other) const
+ * \brief Calculate the minimum of this vector and \a other element-wise
+ * \param[in] other The other vector
+ * \return The element-wise minimum of this vector and \a other
+ */
+
+/**
+ * \fn Vector::min(T scalar) const
+ * \brief Calculate the minimum of this vector and \a scalar element-wise
+ * \param[in] scalar The scalar
+ * \return The element-wise minimum of this vector and \a scalar
+ */
+
+/**
+ * \fn Vector::max(const Vector &other) const
+ * \brief Calculate the maximum of this vector and \a other element-wise
+ * \param[in] other The other vector
+ * \return The element-wise maximum of this vector and \a other
+ */
+
+/**
+ * \fn Vector::max(T scalar) const
+ * \brief Calculate the maximum of this vector and \a scalar element-wise
+ * \param[in] scalar The scalar
+ * \return The element-wise maximum of this vector and \a scalar
+ */
+
 /**
  * \fn Vector::dot(const Vector<T, Rows> &other) const
  * \brief Compute the dot product

src/ipa/libipa/vector.h

@@ -148,6 +148,26 @@ public:
 		return apply(scalar, [](T a, T b) { return a / b; });
 	}
 
+	constexpr Vector min(const Vector &other) const
+	{
+		return apply(*this, other, [](T a, T b) { return std::min(a, b); });
+	}
+
+	constexpr Vector min(T scalar) const
+	{
+		return apply(*this, scalar, [](T a, T b) { return std::min(a, b); });
+	}
+
+	constexpr Vector max(const Vector &other) const
+	{
+		return apply(*this, other, [](T a, T b) { return std::max(a, b); });
+	}
+
+	constexpr Vector max(T scalar) const
+	{
+		return apply(*this, scalar, [](T a, T b) -> T { return std::max(a, b); });
+	}
+
 	constexpr T dot(const Vector<T, Rows> &other) const
 	{
 		T ret = 0;